4uph

Crystal Structure of Phosphonate Monoester Hydrolase of Agrobacterium radiobacter

spinqualitylabelsall models 4uph, resolution 2.50Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4uph is a 4 chain structure with sequence from Agrrk. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CL, MG NonStd Res: DDZ Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Highly proficient, promiscuous enzymes can be springboards for functional evolution, able to avoid loss of function during adaptation by their capacity to promote multiple reactions. We employ systematic comparative study of structure, sequence and substrate specificity to track the evolution of specificity and reactivity between promiscuous members of clades of the alkaline phosphatase (AP) superfamily. Construction of a phylogenetic tree of protein sequences maps out the likely transition zone between arylsulfatases (ASs) and phosphonate monoester hydrolases (PMHs). Kinetic analysis shows that all enzymes characterized have four chemically distinct phospho- and sulfoesterase activities, with rate accelerations ranging from 1011-1017-fold for their primary and 109-1012-fold for their promiscuous reactions, suggesting that catalytic promiscuity is widespread in the AP-superfamily. This functional characterization and crystallography reveal a novel class of ASs that is so similar in sequence to known PMHs that it had not been recognized as having diverged in function. Based on analysis of snapshots of catalytic promiscuity 'in transition' we develop possible models that would allow functional evolution and determine scenarios for trade-off between multiple activities. For the new ASs we observe largely invariant substrate specificity that would facilitate the transition from ASs to PMHs via trade-off-free molecular exaptation, i.e. evolution without initial loss of primary activity and specificity toward the original substrate. This ability to bypass low activity generalists provides a molecular solution to avoid adaptive conflict. Balancing Specificity and Promiscuity in Enzyme Evolution: Multidimensional Activity Transitions in the Alkaline Phosphatase Superfamily.,van Loo B, Bayer CD, Fischer G, Jonas S, Valkov E, Mohamed MF, Vorobieva A, Dutruel C, Hyvonen M, Hollfelder F J Am Chem Soc. 2018 Nov 30. doi: 10.1021/jacs.8b10290. PMID:30497259 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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